MIC803

3-Pin Microprocessor Supervisor Circuit

with Open-Drain Reset Output

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

August 3, 2015

Revision 1.2

General Description

The MIC803 is a single-voltage supervisor with open-drain

reset

output

that

provides

accurate

power

supply

monitoring and reset generation in microprocessor-based

systems. The function of the device is to assert a reset

signal if the power supply voltage drops below the reset

threshold voltage, and retain this reset for the reset

timeout period once the power supply increases above the

reset threshold voltage.

The MIC803 consumes only 4.5µA of supply current and

offers three reset delay periods of 20ms, 140ms, and

1120ms (minimum). It features factory-programmed reset

threshold levels from 2.63V to 4.63V to accommodate

3.0V, 3.3V, and 5.0V power supplies. It is available in the

compact 3-pin SC-70 and SOT-23 packages.

Datasheets and support documentation are available on

Micrel’s web site at: www.micrel.com.

Features

• 4.5

μA supply current (typical) at 3.6V

• Open-drain /RESET output

• /RESET remains valid with V

• 20ms, 140ms, or 1120ms (minimum) reset timeout

options

• 2.63V to 4.63V preset voltage threshold options

• 2.5% voltage threshold accuracy over temperature

• 3-pin SC70-3 package (2.0mm × 2.1mm)

• 3-pin SOT-23 package (2.3mm × 2.9mm)

• -40

˚C to +125˚C junction temperature range

Applications

• Critical microcomputer power monitoring

• Portable equipment

• Solid state drives

• Printers/computers

• Embedded controllers

Typical Application

100k

RESET

µP

MIC803

GND

GND

RESET